the answer is -$97 for sure. tvb now,tvbnow,bttvb, H3 y1 G8 j8 [4 a
Think about it this way
( U* F$ S0 J9 j9 M公仔箱論壇1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。4 h \* r+ G$ c+ b9 C
2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |